Carrier 69NT40-489-100 Series, Operation And Service Manual

Page: 156 / 178

132 T-305
12.13 SOLENOID VALVE
a. Replacing the Coil
WARNING
Low oxygen levels inside container. Venti-
late container before entering. Stay away
from doors while venting.
1. Cut leads coming from the coil, to approximately two
inches back from the coil. Remove screw and washer
or nut that secures the coil to the plunger. Lift off coil.
2. Verify part number. This information appears on the
coil housing.
3. Insert new coil. Butt splice leads and seal with heat
shrinkable tubing.
b. Replacing the Valve
1. Disconnect nylon tubing and remove screws from
bottom.
2. Insert new valve.
3. Butt splice leads and seal with heat shrinkable tubing.
Reconnect nylon tubing.
12.14 CONTROLLED ATMOSPHERE (CA) CON-
TROLLER MODULE
a. Handling of Controller
Here is a list of guidelines that should be followed when
handling the CA Controller module. These steps should
be implemented when doing
any
arc welding on the unit,
or
when service to the CA system requires handling and
removal of the Controller.
CAUTION
Remove CA Controller module and unplug
all wire harness connectors before per-
forming any arc welding on any part of the
container.
Do not remove wire harnesses from module
unless you are grounded to the unit frame
with a static safe wrist strap.
1. Obtain a grounding wrist strap and a static dissipation
mat. The wrist strap, when properly grounded, will
dissipate any potential build-up on the body. The dis-
sipation mat will provide a static free work surface on
which to place and/or service the Controller. Note:
Dissipation mat may be ordered, CTD P/N
07-00277-00.
2. Disconnect and secure power to the unit.
3. Place strap on wrist and attach the ground or clip end
of the wrist strap to any exposed, unpainted metal
area on the refrigeration unit frame (bolts, screws,
etc.).
4. Carefully remove the Controller. Do not touch any of the
electrical components if possible. Place the Controller
on the static dissipation mat.
5. If you are servicing the CA system, you are free to re-
move the ground strap from your wrist and complete
your work.
6. Upon completion of your service work, put the wrist
strap back on, and re-install the Controller into the CA
system.
b. Removing and Installing Controller Module
Removal:
1. Disconnect all front wire harness (see Figure 84,
page 134) connectors (MA, MB, MC, KA & KB) and
move wiring out of way.
2. Loosen one mounting screw (see Figure 84, page
134 item 1) and pull out the top of the Controller mod-
ule (item2), then lift up and out.
3. Turning the module around will give access to the two
back connectors (EC) which the user can nowdiscon-
nect. Remove module.
4. Remove the new Controller module from its packag-
ing and install it in the CA system. Place the old Con-
troller into the same packaging that accompanied the
new module.
Make sure that you package it in the exact
same manner.
NOTE
This packaging has been designed to protect the
Controller from both physical and electrostatic
discharge damage during storage and transit.
Installation:
Install the Controller module by reversing the above steps.
Torque values for item 1 are 0.23 mkg (20 inch-pounds),
and 0.12 mkg (10 inch-pounds) for all connectors.